Ordering number : ENN6632

Monolithic Linear IC

LA4628

Overview

Package Dimensions

The LA4628 is a 2-channel general-purpose BTL audio

power amplifier provided in a miniature package. It wasdesigned for the best possible audio quality and featuresan extended low band roll-off frequency provided by anewly-developed NF circuit that does not require anexternal capacitor. Furthermore, crosstalk, which cancause muddiness in the audio output, has beensignificantly reduced by both circuit and wiring patternimprovements. Thus this amplifier can provide powerfullows and clear highs.

unit: mm

Note that this device is pin compatible with the 13.5 W

2-channel LA4625, and allows end products differentiatedby their power rating to share the same printed circuitboard.

Any and all SANYO products described or contained herein do not have specifications that can handleapplications that require extremely high levels of reliability, such as life-support systems, aircraftscontrol systems, or other applications whose failure can be reasonably expected to result in seriousphysical and/or material damage. Consult with your SANYO representative nearest you before usingany SANYO products described or contained herein in such applications.SANYO assumes no responsibility for equipment failures that result from using products at values thatexceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or otherparameters) listed in products specifications of any and all SANYO products described or containedherein.

OUTPUT PIN TO GND

C10Impulse noise reduction(Note: The devices ability to withstand shortingto VCC or shorting to ground when VCC is around16 V may be reduced as the value of thiscapacitor is increased. We recommend 0.47 F.)

External ComponentsC1 and C4: Input capacitors. A value of 2.2 F is recommended. Determine the polarity based on the DC potential of thecircuit connected directly to the LA4628 front end. Note that the low band response can be adjusted byvarying fL with the capacitors C1 and C4.C2: Decoupling capacitor (ripple filter)C3: Sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33 F. The startingtime is proportional to the value of this capacitor, and can be set to any desired value.C5: Power-supply capacitorC6, C7, C8, and C9:Oscillation prevention capacitors. Use polyester film capacitors (Mylar capacitors) with excellentcharacteristics. (Note that the series resistors R2, R3, R4, and R5 are used in conjunction with thesecapacitors to achieve stable amplifier operation.) A value of 0.1 F is recommended.C10: Impulse noise reduction capacitor. A value of 0.47 F is recommended. Caution is required when selectingthe value for this capacitor, since increasing its value influences the operation of the circuits that protectagainst shorting the amplifier output pins to VCC or to ground when higher VCC voltages (approximately16 V or higher) are used.R1: Standby switch current limiting resistor. A value of 10 k is recommended when a voltage in the range 2.5to 13.5 V will be applied as the standby switching voltage. Note that this resistor is not optional: it must beincluded.

IC Internal Characteristics and Notes

1. Standby function Pin 4 is the standby switch. A voltage of 2.5 V orhigher must be applied through an external resistor toturn the amplifier on. If a voltage of over 13.5 V will be applied as thestandby mode switching voltage, use the followingformula to determine the value of R1 so that thecurrent entering at pin 4 remains under 500 A.

500 A or lower10 k4R1

Applied standbyvoltage

About 1.4 V(2 VBE)

<applied voltage> 1.4

R1 = 10 k500 APin 4 Internal Equivalent Circuit2. Muting function Pin 5 connects the capacitor that determines the starting time to prevent impulse noise. It can also be used to mutethe amplifier output by shorting pin 5 to ground. When this function is used, the recovery time depends on C3.

No. 6632-4/8

LA46283. Impulse noise improvements While the LA4628 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off(and when switching into or out of standby mode) a 0.47 F capacitor may be inserted between pin 7 and the PREGND pin (pin 3). (Pin 7 is the output amplifier bias pin. Since the ability to withstand shorting the output pins toVCC or ground is reduced for supply voltages over 16 V if the pin 7 capacitance is large, we recommend a value of0.47 F or lower for this capacitor.)4. Protection circuits Due to the system structure of the protection circuit for shorts to VCC or ground, if there is a DC resistance betweenthe amplifier output pins and ground, the protection circuit may operate when power is first applied and theamplifier may fail to turn on. The basic design approach we recommend is not to adopt any designs in which there isa DC resistance between the amplifier outputs and ground. The LA4628 includes a built-in thermal protection circuit to prevent the IC from being damaged or destroyed ifabnormally high temperatures occur. This thermal protection circuit gradually reduces the output if the IC junctiontemperature (Tj) reaches the range 170 to 180C due to inadequate heat sinking or other problem. If the temperaturefalls, the amplifier will restart automatically. The LA4628 also includes other protection circuits. Use of these circuits also requires care during end productdesign and testing.5. Other notes The LA4628 is a BTL power amplifier. When testing this device, the ground systems for the test equipmentconnected to IC inputs, and that for the test equipment connected to IC outputs, must be isolated. Do not use acommon ground.Printed Circuit Pattern(copper foil side)

GNDC5

14

1LA4628

+VCC

C1IN1

++C2

--OUT1R2

C6STB

GND

R1+OUT1R3

C3

C7

IN2C4+C10--OUT2

GND

R4

C8

R5

C9

+OUT2

ILA00349

No. 6632-5/8

LA4628PO VCC

40353025

RL

20

RL

=6

1510

1.075320.17532

0.011.0

06

10

11

12

13

14

15

16

Supply voltage, VCC V

17

18

5 7 100

5 7 1kILA00335

f Response

THD = 3 %15

Response dB

Output power, PO W

5 7 10

THD = 10 %

THD = 1 %

10

010

2 3

5 7 100

2 3

5 7 1k

2 3

5 7 10k

5 7100kILA00338

Total harmonic distortion, THD %

321.07532

10 kHz

0.175

100 Hz1 kHz

320.010.1

5 7 1.0

5 7 10

Output power, PO W

VCC = 13.5 VRL = 4 PO = 1 W

321.075320.17532

0.0110

2 3

5 7 100

2 3

5 7 1k

2 3

5 7 10k

Frequency, f Hz

2 3

5 7100kILA00340

1075

VCC = 13.5 VRL = 4 Rg = 600 VO = 0 dBmMonoat 1 kHz2 3

5 7 100

2 3

5 7 1k

2 3

5 7 10k

2 3

5 7100kILA00339

32

THD POVCC = 13.5 VRL = 6 Rg = 600

1.07532

10 kHz

0.175

1 kHz

32

0.010.1

5 7 100ILA00336

100 Hz2

5 7 1.0

5 7 10

Output power, PO W

THD f

1075

--6

Frequency, f Hz

THD POVCC =13.5 VRL =4 Rg = 600

--4

--1010

2 3

5 7 100ILA00337

CH sep. f

Channel separation, CHsep dB

1075

--2

--8

VCC = 13.5 VRL = 4 Rg = 600

Frequency, f Hz

Total harmonic distortion, THD %

Input voltage, VIN mVrms

20

Total harmonic distortion, THD %

ILA00334

PO f

25

PO VINVCC = 13.5 VRL = 4 f = 1 kHz

107532

Output power, PO W

Output power, PO W

1007532

f = 1 kHzRg = 600 THD = 10 %

VCC = 13.5 VRL = 4 Rg = 10 kVO = 0 dBm

--10--20--30--40--50

CH1 2

--60

CH2 1

--70--80--9010

2 3

5 7 100

2 3

5 7 1k

2 3

5 7 10k

Frequency, f Hz

2 3

5 7100kILA00341

No. 6632-6/8

LA4628VNO Rg

532

0.1753

5 7 1k

5 7 10k

Signal source resistance, Rg

100 Hz OUT1100 Hz OUT2

--60

3 kHz OUT2

3 kHz OUT1

--80

Calculated at SVRR = 20 log

--1000

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

Power supply ripple, VCCR Vrms

1.8

2.0

11

13

15

5V

3(1

17

19

21

Supply voltage, VCC V

23

ILA00343

SVRR fR

VCC = 13.5 VRL = 4 Rg = 0VCCR = 0 dBm

--20

--40

OUT1

--60

OUT2--80

--10010

2 3

5 7 100

2 3

5 7 1k

2 3

5 7 10k

2 3

5 7100kILA00344

Frequency, f Hz

Power dissipation, Pd W

Pd

Pd PO (RL = 6 )

RL = 6 Rg = 600 f = 1 kHzCalculated atPd = (VCC ICC) -- (2PO)

282420

6.5

V)

1d(

16

P12

3.5

(1Pd

V)

84

400.1

5 7 1.0

5 7 10

Output power, PO W/ch

5 7 100ILA00346

00.1

5 7 1.0

5 7 10

Output power, PO W/ch

5 7 100ILA00347

ICC PORL = 4 / 6 Rg = 600 f = 1 kHz

=4

Current drain, ICC A

--80

32

12

OUT2

--60

ILA00345

V)(16.5

16

Pd

Power dissipation, Pd W

Pd PO (RL = 4 )

VOVCCR

RL = 4 Rg = 600 f = 1 kHzCalculated atPd = (VCC ICC) -- (2PO)

20

OUT1

ILA00342

VCC = 13.5 VRL = 4 Rg = 0

--40

24

--40

5 7 100k

SVRR VCCR

--20

28

--20

--1202

32

Rg = 0fR = 100 HzVCCR = 0 dBm

--100

0.01100

Ripple rejection ratio, SVRR dB

Ripple rejection ratio, SVRR dB

SVRR VCC

VCC = 13.5 VRL = 4 DIN AUDIO

Ripple rejection ratio, SVRR dB

Output noise voltage, VNO mVrms

1.0

00.1

5 7 1.0

5 7 10

Output power, PO W/ch

5 7 100ILA00348

No. 6632-7/8

LA4628

Specifications of any and all SANYO products described or contained herein stipulate the performance,characteristics, and functions of the described products in the independent state, and are not guaranteesof the performance, characteristics, and functions of the described products as mounted in the customersproducts or equipment. To verify symptoms and states that cannot be evaluated in an independent device,the customer should always evaluate and test devices mounted in the customers products or equipment.SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and allsemiconductor products fail with some probability. It is possible that these probabilistic failures couldgive rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,or that could cause damage to other property. When designing equipment, adopt safety measures sothat these kinds of accidents or events cannot occur. Such measures include but are not limited to protectivecircuits and error prevention circuits for safe design, redundant design, and structural design.In the event that any or all SANYO products (including technical data, services) described or containedherein are controlled under any of applicable local export control laws and regulations, such products mustnot be exported without obtaining the export license from the authorities concerned in accordance with theabove law.No part of this publication may be reproduced or transmitted in any form or by any means, electronic ormechanical, including photocopying and recording, or any information storage or retrieval system,or otherwise, without the prior written permission of SANYO Electric Co., Ltd.Any and all information described or contained herein are subject to change without notice due toproduct/technology improvement, etc. When designing equipment, refer to the Delivery Specificationfor the SANYO product that you intend to use.Information (including circuit diagrams and circuit parameters) herein is for example only; it is notguaranteed for volume production. SANYO believes information herein is accurate and reliable, butno guarantees are made or implied regarding its use or any infringements of intellectual property rightsor other rights of third parties.This catalog provides information as of September, 2000. Specifications and information herein aresubject to change without notice.PS No. 6632-8/8